public TokenTagCollection Match(SnapshotSpan span)
{
var tokenTags = new TokenTagCollection(span);
string token = span.GetText();
int position = span.Start + token.Length;
if (_builtInTokens.Contains(token))
{
tokenTags.SetClassifierTag(BUILT_IN_TOKEN_TYPE);
}
else if (IsFloatingConstant(token))
{
tokenTags.SetClassifierTag(FLOAT_TOKEN_TYPE);
}
else if (IsIntegerConstant(token))
{
var isFloat = false;
// Now that we have matched with an integer, look ahead to see if we are followed by a decimal
if (span.Snapshot.GetText(span.End, 1) == ".")
{
var nConsumed = 1;
var text = span.Snapshot.GetText();
for (var i = span.End.Position + 1; i < text.Length; i++)
{
if (char.IsNumber(text[i]))
{
isFloat = true;
nConsumed++;
}
else if (text[i] == 'f' || text[i] == 'F')
{
nConsumed++;
break;
}
else if (text[i] == 'l')
{
if (text[i + 1] == 'f' || text[i + 1] == 'F')
{
nConsumed += 2;
}
else
{
isFloat = false;
}
break;
}
else
{
break;
}
}
if (isFloat)
{
tokenTags.ClassifierTagSpan = new TagSpan <GLSLClassifierTag>(span.Extended(nConsumed), new GLSLClassifierTag(FLOAT_TOKEN_TYPE));
}
}
if (!isFloat)
{
tokenTags.SetClassifierTag(INT_TOKEN_TYPE);
}
}
return(tokenTags);
}
